Braille is derived from the Latin alphabet, albeit indirectly. In Braille's original system, the dot patterns were assigned to letters according to their position within the alphabetic order of the French alphabet, with accented letters and w sorted at the end.
The first ten letters of the alphabet, a–j, use the upper four dot positions: ⠁⠃⠉⠙⠑⠋⠛⠓⠊⠚.
The next ten letters, k–t, are identical to a–j, respectively, apart from the addition of a dot at position 3: ⠅⠇⠍⠝⠕⠏⠟⠗⠎⠞, and so on, and so on...
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